I have not tried the newer Phonaks, so I am the wrong person to ask.
I still don't understand the not connecting. If you can prep the HAs, then connect the HAs to get that wrong side message;
Then that happens if you switch cables/sides, prep the HAs for connection, then try to connect?
There is an ear gauge to measure receiver length. But if you have already worn certain sizes here's some tips. Ideally the wire should lie flat against your face as close as possible. If it is away from your face, Oh say 1/4" or so, then it is likely because the length is too long. If it pulls very tightly between your ear canal and the top of your ear (maybe even leaving dark red marks atop your ear and cause pain to your ear canal) then it is likely too short. AFAIK double vent = two holes.
